Oil-in-water emulsion skin care cosmetic composition

ABSTRACT

To provide an oil-in-water emulsion skin care cosmetic composition which, without the addition of a pharmaceutical agent and a film-forming agent or the like thereto, effects an excellent elastic or resilient feeling to skin and is excellent in non-stickiness and stability. An oil-in-water emulsion skin care cosmetic composition, comprising (a) a paraffin wax and/or a polyethylene wax, (b) a microcrystalline wax, and (c) an animal/plant-derived wax which contains, as the main ingredient thereof, an ester of a higher fatty acid having from 20 to 32 carbon atoms and an alcohol having from 28 to 34 carbon atoms, and has a melting point of from 75 to 100° C., in which the ratio of component (a) to component (b) is from 70/30 to 95/5 (by mass).

TECHNICAL FIELD

The present invention relates to an oil-in-water (O/W) emulsion skincare cosmetic composition. More precisely, the invention relates to anoil-in-water emulsion skin care cosmetic composition which, without theneed for adding a pharmaceutical agent and a film-forming agent or thelike thereto, effects an excellent elastic or resilient feeling to skinand is excellent in non-stickiness and stability.

BACKGROUND ART

Heretofore, for delaying or preventing the reduction of skin elasticityor resilience and the appearance of wrinkles due to ageing, etc., andfor concealing wrinkles by using a skin care cosmetic composition, therehas been known a method of using a pharmaceutical agent of vitamin A orits derivatives or the like (e.g., see Patent References 1 and 2). As aningredient capable of effecting an elastic or resilient feeling to skinwithin a short period of time, there has been known a film-forming agentsuch as polyvinyl alcohol, polyvinyl pyrrolidone, acrylic resin or thelike, or a silicone elastomer or the like (e.g., see Patent References 3to 5).

However, the method of using a pharmaceutical agent requires long-termcontinuous use of the agent, and according to the method, it isdifficult to stably keep the pharmaceutical agent in the base withoutlowering the efficacy of the pharmaceutical agent. On the other hand,the method of using a film-forming agent or the like has some problemsin that, when the agent is added in an amount enough to satisfy thefeeling of skin resilience or elasticity, then it may occur the scum orsettling come from the applied cosmetic composition and the stickinessin its application onto the skin, that the stability of the agent ispoor in long-term storage thereof, and that the agent adversely affectsthe stability of the other additive ingredients, etc.

PRIOR ART REFERENCES Patent References

-   Patent Reference 1: JP 8-245366A-   Patent Reference 2: JP 3634139B-   Patent Reference 3: JP 2007-269723A-   Patent Reference 4: JP 5-933A-   Patent Reference 5: JP 9-315936A

SUMMARY OF INVENTION Problems that Invention is to Solve

The present invention has been made in consideration of theabove-mentioned situation, and its object is to provide an oil-in-wateremulsion skin care cosmetic composition which, without the need foradding a pharmaceutical agent and a film-forming agent or the likethereto, effects an excellent elastic or resilient feeling to skin andis excellent in non-stickiness and stability.

Means for Solving the Problems

In order to solve the above-mentioned problems, the invention providesan oil-in-water emulsion skin care cosmetic composition which comprises(a) a paraffin wax and/or a polyethylene wax, (b) a microcrystallinewax, and (c) an animal/plant-derived wax which contains as the mainingredient thereof, an ester of a higher fatty acid having from 20 to 32carbon atoms and an alcohol having from 28 to 34 carbon atoms, and thathas a melting point of from 75 to 100° C., wherein the ratio ofcomponent (a) to component (b) is from 70/30 to 95/5 (by mass).

The invention also provides the oil-in-water emulsion skin care cosmeticcomposition, wherein component (c) is carnauba wax.

The invention also provides the oil-in-water emulsion skin care cosmeticcomposition, wherein the total amount of component (a) and component (b)is from 0.01 to 2% by mass, and the amount of component (c) is from0.005 to 2% by mass.

Advantageous Effects of Invention

According to the invention, there is provided an oil-in-water emulsionskin care cosmetic composition which, without the addition of apharmaceutical agent and a film-forming agent or the like thereto,effects an excellent elastic or resilient feeling to skin and isexcellent in non-stickiness and stability.

MODE FOR CARRYING OUT INVENTION

The invention is described in detail hereinunder. In the following,“POE” means “polyoxyethylene”, and “POP” means “polyoxypropylene”.

In the invention, a paraffin wax and/or a polyethylene wax is used ascomponent (a).

The paraffin wax is generally obtained through separation and extractionof a hydrocarbon of good crystallizability from the oily distillatemoiety in reduced-pressure distillation of crude oil. It is a colorlessor white transparent solid wax containing a linear hydrocarbon as themain ingredient thereof, and that has a mass-average molecular weight(Mw; hereinafter simply referred to as “molecular weight”) of from 200to 700 or so.

The polyethylene wax is a synthetic wax and is a low-molecular-weightethylene polymer that exhibits a white waxy solid state. In theinvention, preferred is use of those having a molecular weight (Mw) offrom 300 to 700, especially from 400 to 600 or so. Component (a) may beused either alone or in combination.

The microcrystalline wax as component (b) is mainly a hydrocarbon wax tobe taken out from the residual oily moiety in reduced-pressuredistillation of crude oil, in which many of the constitutivehydrocarbons are branched hydrocarbons (isoparaffin) and saturatedcyclic hydrocarbons (cycloparaffin). Accordingly, as compared with thatof the paraffin wax of component (a), the crystal size of the ingredientis small, and the molecular weight thereof is generally from 500 to 800or so. The melting point of component (b) is from 60 to 90° C. or so.Component (b) is commercially available as “Microcrystalline Wax P” (byNikko Rica Corp.), etc. Component (b) may be used either alone or incombination.

In the invention, component (a) and component (b) are incorporated insuch a blend ratio that (a)/(b) is from 70/30 to 95/5 (by mass). Whenthe ratio of component (a) to component (b) is larger than the aboverange, then component (a) may readily crystallized because of its highcrystallizability, and therefore the stability of the compositionbecomes poor; but on the other hand, when the ratio is smaller than therange, it tends to occur stickiness.

In the invention, the total amount of component (a) and component (b) ispreferably from 0.01 to 2% by mass, more preferably from 0.05 to 1% bymass, most preferably from 0.2 to 0.5% by mass. When the amount is lessthan 0.01% by mass, then it tends to lose the resilient feeling; but onthe other hand, when the amount is more than 2% by mass, then thecrystallizability becomes high and the ingredients may readilycrystallized, and therefore the stability of the composition becomespoor.

Component (c) is an animal/plant-derived wax comprising, as the mainingredient thereof, an ester of a higher fatty acid having from 20 to 32carbon atoms and an alcohol having from 28 to 34 carbon atoms (the esteraccounts for from about 80 to 85% by mass of component (c)), and havinga melting point of from 75 to 100° C. The melting point is preferablyfrom 80 to 90° C. Preferred is a plant-derived wax. In concrete terms,preferred examples include carnauba wax, and rice wax (rice bran wax).Above all, most preferred is carnauba wax.

Candelilla wax is not within the scope of component (c) in theinvention, although it is, like carnauba wax, a type of plant-derivedwax and is popularly used in cosmetic compositions, as it contains afatty acid ester having from 16 to 34 carbon atoms in an amount of about30% by mass, a hydrocarbon such as hentriacontane (C₃₁H₆₄) or the likein an amount of about 45% by mass, and a free alcohol, a resin or thelike in an amount of about 25% by mass, and has a melting point of from66 to 71° C.

The amount of component (c) to be incorporated is preferably from 0.005to 2% by mass in the entire amount of the cosmetic composition of theinvention, more preferably from 0.01 to 1% by mass, most preferably from0.01 to 0.5% by mass. When the amount is less than 0.005% by mass, thenit could not prevent the crystallization of component (a) and therefore,the stability of the composition may be poor; but on the other hand,when the amount is more than 2% by mass, the stickiness tends toincrease.

The ratio of component (c) to the total amount of component (a) andcomponent (b) (by mass), i.e., (c)/[(a)+(b)] (by mass), is preferably atleast 0.02 from the viewpoint of the stability of the composition. Theuppermost limit is not specifically defined, but is preferably at most 1(by mass).

In the cosmetic composition of the invention, the combination ofcomponents (a) to (c) allowed the enhancement of the penetration of thecomposition into skin and of the resilient feeling of skin, and theattainment of the sufficient stability of the composition. Sincecomponent (a) exhibits high crystallizability, the combination ofcomponent (a) and component (b) only could hardly attain sufficientstability of the composition; however, the incorporation of component(c) thereinto permitted the enhancement of the stability of thecomposition. Furthermore, not acted upon by a pharmaceutical ingredientsuch as vitamin A, a film-forming agent, a silicone resin or the like aspreviously, the composition of the invention could secure an excellentresilient feeling of skin, and could secure good feeling in use (with nostickiness or tackiness) and good stability.

An emulsifying agent is further incorporated in the oil-in-wateremulsion skin care cosmetic composition of the invention, in which,however, the emulsifying agent is not specifically defined but may beany one that may be generally incorporated in emulsion cosmeticcompositions, such as nonionic surfactants (oleophilic, hydrophilic),anionic surfactants, cationic surfactants, and ampholytic surfactants,etc.

Exemplary oleophilic nonionic surfactants include sorbitan fatty acidesters, such as sorbitan monooleate, sorbitan monoisostearate, sorbitanmonolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitansesquioleate, sorbitan trioleate, diglycerolsorbitanpenta-2-ethylhexylate, and diglycerolsorbitan tetra-2-ethylhexylate;(poly)glycerin fatty acid esters, such as glycerin monostearate, anddiglycerin monostearate; propyleneglycol fatty acid esters such aspropylene glycol monostearate; hydrogenated castor oil derivatives, andglycerin alkyl ethers.

Exemplary hydrophilic nonionic surfactants include POE sorbitan fattyacid esters, such as POE sorbitan monooleate, POE sorbitan monostearate,POE sorbitan monolaurate, and POE sorbitan tetraoleate; POE sorbitolfatty acid esters, such as POE sorbitol monolaurate, POE sorbitolmonooleate, POE sorbitol pentaoleate, and POE sorbitol monostearate; POEglycerin fatty acid esters, such as POE glycerin monostearate, and POEglycerin triisostearate; POE fatty acid esters such as POE monooleate;POE alkyl ethers such as POE lauryl ether; POE alkylphenyl ethers suchas POE octylphenyl ether; POE/POP alkyl ethers such as POE/POP cetylether; tetra-POE/tetra-POP ethylenediamine condensates, POE castor oilor hardened castor oil derivatives, POE bees wax/lanolin derivatives,alkanolamides such as lauric acid monoethanolamide, POE propylene glycolfatty acid esters, POE alkylamines, POE fatty acid amides, sucrose fattyacid esters, POE nonylphenyl-formaldehyde condensates,alkylethoxydimethylamine oxides, and trioleylphosphoric acid.

Exemplary anionic surfactants include fatty acid soaps, such as soapbase, lauric acid salts (salts with sodium, potassium, magnesium,ammonium, monoethanolamine, triethanolamine or the like—the same shallapply hereinunder), and palmitic acid salts; higher alkylsulfate saltssuch as lauryl sulfate salts; alkyl ether sulfate salts such as POElauryl sulfate salts; N-acyl sarcosine acid salts such aslauroylsarcosine salts; phosphate salts, such as POE oleyl etherphosphate salts, and POE stearyl ether phosphate salts; sulfosuccinicacid salts, such as di-2-ethylhexyl-sulfosuccinic acid salts,monolauroyl-monoethanolamide-polyoxyethylene-sulfosuccinic acid salts,and laurylpolypropylene glycol sulfosuccinic acid salts;alkylbenzenesulfonic acid salts such as linear dodecylbenzenesulfonicacid salts; N-acylglutamic acid salts, such as N-lauroylglutamic acidsalts, and N-myristoyl-L-glutamic acid salts; N-acylglutamic acid salts,such as N-lauroylglutamic acid salts, N-myristoylglutamic acid salts,and N-stearoylglutamic acid salts; N-acylglycine salts, such asN-lauroylglycine salts, N-myristoylglycine salts, and N-stearoylglycinesalts; N-acylalanine salts, such as N-lauroylalanine salts,N-myristoylalanine salts, and N-stearoylalanine salts; N-acylasparticacid salts, such as N-lauroylaspartic acid salts, N-myristoylasparticacid salts, and N-stearoylaspartic acid salts; long-chain acyl-loweralkyl-type taurine salts, such as N-cocoyl-N-methyltaurine salts,N-lauroyl-N-methyltaurine salts, N-myristoyl-N-methyltaurine salts,N-stearoyl-N-methyltaurine salts, and N-cocoyltaurine salts;hydroxyether-carboxylic acid salts such as dodecane-1,2-diol acetateether salts; higher fatty acid ester sulfate salts such as hydrogenatedcoconut oil fatty acid glycerin sulfate salts; sulfated oils such asTurkey red oil; POE alkyl ether-carboxylic acid salts, POE alkylallylether-carboxylic acid salts, α-olefinsulfonic acid salts, higher fattyacid ester sulfonic acid salts, dialcohol sulfate salts, higher fattyacid alkylolamide sulfate salts, lauroylmonoethanolamide succinic acidsalts, and N-palmitoylaspartic acid disalts.

Exemplary cationic surfactants include alkyltrimethylammonium salts,such as stearyltrimethylammonium chloride, and lauryltrimethylammoniumchloride; dialkyldimethylammonium salts such asdistearyldimethylammonium chloride; alkylpyridinium salts, such aspoly(N,N′-dimethyl-3,5-methylenepiperidinium) chloride, andcetylpyridinium chloride; alkyl quaternary ammonium salts,alkyldimethylbenzylammonium salts, alkylisoquinolinium salts,dialkylmorpholinium salts, POE alkylamines, alkylamine salts, polyaminefatty acid derivatives, amyl alcohol fatty acid derivatives,benzalkonium chloride, and benzetonium chloride.

Exemplary ampholytic surfactants include imidazoline-type ampholyticsurfactants, such as2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, and2-cocoyl-2-imidazoliniumhydroxide-1-carboxyethyloxy 2-sodium salt;betaine-type surfactants, such as2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine,betaine lauryldimethylaminoacetate, alkylbetaine, amidebetaines, andsulfobetaine.

As the emulsifying agent in the invention, preferred is a nonionicsurfactant alone, or a combination of a nonionic surfactant and ananionic surfactant, especially a long-chain acyl-lower alkyl-typetaurine-type anionic surfactant (for example, stearoylmethyltaurinesalt, etc.), from the viewpoint of the stability or the like of thecomposition.

The oil-in-water emulsion skin care cosmetic composition of theinvention may suitably contain, if desired in addition to theabove-mentioned ingredients, any other optional additive ingredientgenerally used in external applications for skin care such as ordinarycosmetic products or medicinal products, etc., within a range notdetracting from the object and the advantages of the invention. Forexample, the optional ingredient includes, but not limited thereto, oilsand fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols,synthetic ester oils, silicone oils, water-soluble polymers, chelatingagents, lower alcohols, polyalcohols, pH-regulating agents,antioxidants, powdery ingredients, fragrance, and water.

Exemplary oils and fats include liquid oils and fats, such as corn oil,olive oil, rapeseed oil, castor oil, soybean oil, peanut oil, andglycerin triisooctanoate; solid oils and fats, such as cacao butter, andhydrogenated oil.

Exemplary waxes include bees wax and lanolin.

Exemplary hydrocarbon oils include liquid paraffin, squalane, ceresine,vaseline, and paraffin.

Exemplary higher fatty acids include lauric acid, myristic acid,palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid,tolic acid, isostearic acid, linolic acid, linolenic acid,eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

Exemplary higher alcohols include linear alcohols, such as laurylalcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristylalcohol, oleyl alcohol, and cetostearyl alcohol; branched alcohols, suchas monostearylglycerin ether (batyl alcohol), 2-decyltetradecinol,lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearylalcohol, and octyldodecanol.

Exemplary synthetic ester oils include isopropyl myristate, octyldodecylmyristate, myristyl myristate, isopropyl palmitate, hexyl laurate, decyloleate, oleyl oleate, cetyl lactate, isocetyl isostearate, diisopropyladipate, diethyl sebacate, diisopropyl sebacate, and crotamiton(C₁₃H₁₇NO).

Exemplary silicone oils include linear polysiloxanes, such asdimethylpolysiloxane and methylphenylpolysiloxane.

Exemplary water-soluble polymers include plant polymers, such ascarrageenan, pectin, and corn starch; microorganismic polymers, such asxanthane gum, pullulane, and sodium hyaluronate; cellulosic polymers,such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose,hydroxypropyl cellulose, carboxymethyl cellulose, and sodiumcarboxymethyl cellulose; alginic acid polymers such as sodium alginate;vinylic polymers, such as polyvinyl alcohol, polyvinyl pyrrolidone, andcarboxyvinyl polymer; and acrylic acid polymers, such as sodiumpolyacrylate, polyethyl acrylate, and polyacrylamide.

Exemplary chelating agents include sodium edetate and sodiummetaphosphate.

Exemplary lower alcohols include ethanol and isopropanol.

Exemplary polyalcohols include dialcohols, such as propylene glycol and1,3-butylene glycol; trialcohols, such as glycerin and1,2,6-hexanetriol; tetralcohols such as pentaerythritol; pentalcoholssuch as xylitol; hexylcohols, such as sorbitol and mannitol; polyalcoholpolymers, such as dipropylene glycol, triethylene glycol, andpolyethylene glycol; and sugar alcohols, such as sorbitol and mannitol.

Exemplary pH regulating agents include buffers, such as lacticacid-sodium lactate and citric acid-sodium citrate; amino acids such asglycine.

Exemplary antioxidants include dibutylhydroxytoluene (BHT) andbutylhydroxyanisole (BHA).

Exemplary powder ingredients include inorganic powders, such as talc,kaolin, bentonite, magnesium aluminate silicate, silicic anhydride,titanium oxide, and zinc oxide; organic powders such as cellulosepowder; inorganic pigments, such as iron sesquioxide, yellow ironsesquioxide, and black iron oxide; and organic pigments such asaluminium lake.

Other incorporable ingredients include preservatives, such asethylparaben and butylparaben; antiinflammatory agents, such asglycyrrhizinate derivatives, glycyrrhetinate derivatives, salicylic acidderivatives, and allantoin; vitamins, such as vitamin B6, vitamin C,vitamin E and their derivatives, and panthenol; various extracts, suchas Rosa roxburghii, Achillea millefolium, melilot, Phellodendoronamurense Ruprecht, Cpotis japonica, Lithospermum erythrorhizon, Chinesepeony, Swertia japonica, birch, sage, loquat, ginseng, aloe, Malvasylvestris, iris, grape, coix seed, sponge cucumber, lily, saffron,Cnidium rhizome, ginger, Hypericum erectum, Ononis spinosa, garlic,capsicum, Chenpi, Angelica acutiloba, and algae; blood circulationpromoters, such as vanillylamide nonylate and benzyl nicotinate;fresheners, such as l-menthol and eucalyptus oil; skin-whitening agents(e.g., hydroquinone derivatives such as arbutin; kojic acid, tranexamicacid and their derivatives, etc.); antioxidants, such as thiotaurine,glutathione, catechin, albumin, ferritin, and metallothionein; and UVabsorbents, such as benzoic acid-type UV absorbents, salicylic acid-typeUV absorbents, cinnamic acid-type UV absorbents, and benzophenone-typeUV absorbents.

The oil-in-water emulsion skin care cosmetic composition of theinvention can be obtained according to an ordinary method of, forexample, by previously preparing an oily phase and an aqueous phase, andthereafter gradually adding the oily phase to the aqueous phase,followed by emulsifying them by mixing, stirring or the like, but notlimited thereto. In the cosmetic composition of the invention,preferably, the aqueous phase accounts for from 60 to 97% by mass andthe oily phase accounts for from 3 to 40% by mass.

In the invention, the cosmetic composition effects an excellentresilient feeling to skin, without the need for incorporating thereintoany ordinary film-forming agent (e.g., polyvinyl alcohol, polyvinylpyrrolidone, and acrylic resin), vitamin A or its derivative, and asilicone elastomer or the like, in an amount necessary for making a goodrecovery of resilient feeling or for enhancing the resilient feeling.However, the invention does not exclude the addition of a small amountof such an ordinary resilient feeling-recovering ingredient as anoptional additive ingredient to the cosmetic composition of theinvention.

The oil-in-water emulsion skin care cosmetic composition of theinvention is widely applicable to cosmetic products, medicinal productsand quasi drugs to be applied to the skin. The composition may have anydesired form of products, including emulsion products such as emulsionfoundations, and sunscreen emulsions; creamy products such as skincreams, etc.

EXAMPLES

The invention is described more concretely with reference to thefollowing Examples, by which, however, the invention is not limited atall. Unless otherwise specifically indicated, the amount is described interms of % by mass.

[State Stability]

After samples were prepared, each sample was tested for the presence orabsence of its abnormality such as aggregation or coalescence ofemulsified particles, crystal deposition, etc., by microscopicobservation, and evaluated it according to the following evaluationcriteria.

(Evaluation Criteria)

◯ (good): No abnormality was observed.

Δ (somewhat bad): Slight abnormality was observed.

x (bad): Apparent abnormality was observed.

[Resilient Feeling]

Ten women expert panelists applied each sample onto their skin andevaluated the resilient feeling of the skin after application accordingto the following evaluation criteria.

(Evaluation Criteria)

◯ (good): Seven or more panelists admitted the resilient feeling.

Δ (somewhat bad): From 3 to 6 panelists admitted the resilient feeling.

x (bad): Two or less panelists admitted the resilient feeling.

[Non-Stickiness]

Ten women expert panelists applied each sample onto their skin andevaluated the non-stickiness of the skin after application according tothe following evaluation criteria.

(Evaluation Criteria)

◯ (good): Seven or more panelists admitted the non-stickiness.

Δ (somewhat bad): From 3 to 6 panelists admitted the non-stickiness.

x (bad): Two or less panelists admitted the non-stickiness.

Examples 1 to 6, Comparative Examples 1 to 5

Samples each containing the ingredients shown in the following Tables 1and 2 in the blend ratio also shown therein were prepared according toan ordinary method. The prepared samples were evaluated according to theabove-mentioned evaluation methods for the stability (state stability),the resilient feeling and the non-stickiness. The results are shown inTables 1 and 2.

TABLE 1 Example 1 2 3 4 5 6 Polyethylene Wax 0.32 0.4 — 0.45 0.4 0.64Paraffin Wax — — 0.5 — — — Microcrystalline Wax 0.08 0.1 0.03 0.05 0.10.16 Carnauba Wax 0.2 0.02 0.02 0.5 0.1 0.1 Behenyl Alcohol 0.8 0.6 0.50.4 2 0.6 Stearyl Alcohol — — 0.15 0.3 — 0.2 Batyl Alcohol — — — — 1 —Palm Oil 0.5 0.5 0.8 0.5 0.5 — Mineral Oil 4.5 3 2.5 3 — 3.5Pentaerythrityl 2 2.5 3 3 6 3 Tetraethylhexanoate Dimethicone 1 1 0.11.5 2.5 1 PEG-60 Glyceryl Isostearate — — — — 1.5 — Sodium Stearoyl- 0.20.15 0.15 0.2 — 0.15 methyltaurine Glyceryl Stearate 0.3 0.3 0.2 0.2 1.50.2 Ethanol — — — — 5 — Carboxyvinyl Polymer 0.1 0.1 0.1 0.15 — 0.12Potassium Hydroxide — — — — 0.03 0.03 Xanthan Gum 0.05 0.1 0.02 — 0.10.05 Polyvinyl Alcohol 0.2 — 0.2 — — — Glycerin 3 5 10 15 2 3 ButyleneGlycol 8 5 15 10 6 5 Tranexamic Acid 2 2 2 2 — — Potassium — — — — 1 —4-Methoxysalicylate Citric Acid 0.05 0.05 0.05 0.05 0.01 0.01 SodiumCitrate 0.05 0.05 0.05 0.05 0.09 0.09 Phenoxyethanol 0.5 0.5 0.5 0.5 0.40.5 Trisodium Edetate 0.1 0.01 0.03 0.03 0.1 0.01 Pure Water bal. bal.bal. bal. bal. bal. State Stability ◯ ◯ ◯ ◯ ◯ ◯ Resilient Feeling ◯ ◯ ◯◯ ◯ ◯ Non-stickiness ◯ ◯ ◯ ◯ ◯ ◯

TABLE 2 Comparative Example 1 2 3 4 5 Polyethylene Wax 0.32 — — 0.32 —Paraffin Wax — — — — 0.48 Microcrystalline Wax 0.08 0.5 — 0.08 0.22Carnauba Wax — — — — 0.1 Candelilla Wax — — — 0.2 — Behenyl Alcohol 0.80.8 0.8 0.8 0.8 Palm Oil 0.5 0.5 0.5 0.5 0.5 Mineral Oil 4.5 4.5 4.5 4.54.5 Pentaerythrityl Tetraethyl- 2 2 2 2 2 hexanoate Dimethicone 1 1 1 11 Sodium Stearoylmethyltaurine 0.2 0.2 0.2 0.2 0.2 Glyceryl Stearate 0.30.3 0.3 0.3 0.3 Carboxyvinyl Polymer 0.1 0.1 0.1 0.1 0.1 Xanthan Gum0.05 0.05 0.05 0.05 0.05 Polyvinyl Alcohol 0.2 0.2 0.5 0.2 0.2 Glycerin3 3 3 3 3 Butylene Glycol 8 8 8 8 8 Citric Acid 0.01 0.01 0.01 0.01 0.01Sodium Citrate 0.09 0.09 0.09 0.09 0.09 Phenoxyethanol 0.5 0.5 0.5 0.50.5 Trisodium Edetate 0.01 0.01 0.01 0.01 0.01 Pure Water bal. bal. bal.bal. bal. State Stability Δ ∘ Δ Δ ∘ Resilient Feeling ∘ Δ ∘ ∘ ∘Non-stickiness ∘ x x ∘ x

As obvious from the results in Tables 1 and 2, Examples 1 to 6satisfying the constituent requirements of the invention achievedexcellent advantageous effects in point of all the stability, theresilient feeling and the non-stickiness. On the other hand, ComparativeExamples 1 to 5 lacking any of the constituent requirements of theinvention could not achieve the advantageous effects of the invention.For example, Comparative Example 3, which did not contain any one ofcomponents (a) to (c) and contained an ordinary film-forming agent forthe intension of attaining a resilient feeling of skin, could notachieve the non-stickiness and could not satisfy stability. InComparative Example 4, in which candelilla wax was incorporated in placeof component (c), the stability of the sample was poor. ComparativeExample 1, which did not contain component (c), was poor in itsstability. Comparative Example 2, which contained component (b) but didnot contain component (a) and component (c), could not achieve thenon-stickiness and was poor in the resilient feeling of the skin.Comparative Example 5, which contained components (a) to (c), however,the blend ratio of component (a) to component (b) was smaller than therange of the invention, could not obtain non-stickiness.

Formulation Examples of the oil-in-water emulsion skin care cosmeticcomposition of the invention are shown below.

Example 7 O/W Milky Emulsion

(Ingredients) (mas %)  (1) Behenyl Alcohol 0.8  (2) Batyl Alcohol 0.1 (3) Polyethylene Wax 0.4  (4) Microcrystalline Wax 0.1  (5) CarnaubaWax 0.1  (6) Glyceryl Stearate 0.2  (7) Pentaerythritoltetra-2-ethylhexanoate 3  (8) Dimethicone 0.5  (9) Squalane 3 (10)Sodium Stearoylmethyltaurine 0.2 (11) Glycerin 5 (12) 1,3-ButyleneGlycol 7 (13) Tranexamic Acid 2 (14) Sodium Carboxyvinyl Polymer 0.1(15) Sodium Metaphosphate 0.01 (16) Phenoxyethanol 0.5 (17) Pure Waterbal.(Production Method)

The aqueous phase and the oily phase are heated at 70° C., thereafteremulsified with a homomixer and then cooled.

Example 8 O/W Cream

(Ingredients) (mas %)  (1) Polyethylene Wax 0.4  (2) MicrocrystallineWax 0.1  (3) Carnauba Wax 0.02  (4) Sorbitan POE(20) Isostearate 2.5 (5) PEG-100 Stearate 0.5  (6) Glyceryl Stearate 1.2  (7) BehenylAlcohol 1.5  (8) Stearyl Alcohol 0.5  (9) Mineral Oil 4 (10) CetylEthylhexanoate 4 (11) Pentaerythrityl Tetraoctanoate 4 (12) Dimethicone3 (13) Bentonite 0.3 (14) Glycerin 15 (15) Dipropylene Glycol 8 (16)Dipotassium Glycyrrhizinate 0.1 (17) Sodium Metaphosphate 0.1 (18)Phenoxyethanol 0.5 (19) Citric Acid 0.01 (20) Sodium Citrate 0.09 (21)Pure Water bal.(Production Method)

The aqueous phase and the oily phase are heated at 70° C., thereafteremulsified with a homomixer and then cooled.

INDUSTRIAL APPLICABILITY

According to the invention, there is provided an oil-in-water emulsionskin care cosmetic composition which, without the addition of apharmaceutical agent and a film-forming agent or the like thereto,effects an excellent elastic or resilient feeling to skin and isexcellent in non-stickiness and stability.

The invention claimed is:
 1. An oil-in-water emulsion skin care cosmeticcomposition, comprising: (a) a paraffin wax and/or a polyethylene wax,(b) a microcrystalline wax, and (c) an animal/plant-derived wax whichcontains an ester of a fatty acid having from 20 to 32 carbon atoms andan alcohol having from 28 to 34 carbon atoms, and has a melting point offrom 75 to 100° C., wherein the ratio of the component (a) to thecomponent (b) is from 70/30 to 95/5 by mass and wherein the total amountof the component (a) and the component (b) is from 0.01 to 2% by mass,and the amount of the component (c) is from 0.005 to 2% by mass of theemulsion.
 2. The oil-in-water emulsion skin care cosmetic composition asclaimed in claim 1, wherein the component (c) is carnauba wax.